Patent GB-766208-A (GB)
Title: Improvements in swash plate hydraulic pumps or motors
IPC: F01B3/10
Filed: 1955-02-08
Abstract: 766,208. Reciprocating pumps for liquids; hydraulic motors. ORSHANSKY, E., COLNON, A. B., FLAM, J., and PRESTRESSED CONCRETE CORPORATION, [trading as CROWN ENGINEERING & DEVELOPMENT CO.]. Feb. 8, 1955 [Feb. 25, 19541, No. 3747/55. Class 102(1) [Also in Group XXIX] In apparatus usable as a pump for liquids or an hydraulic motor and comprising a cylinder block having several cylinders arranged equi-angularly therein and symmetrical about an axis with their axes parallel to that axis and each containing a piston structure reciprocally mounted therein under the actuation of a pair of reaction members having surfaces inclined to the axes of the cylinders and in engagement with the pistons at opposite ends of the block, the" block-and reaction members being relatively rotatable about the axis of the block, the reaction members are rigidly secured together by a connecting member. A drive shaft 34 is splined to a sleeve 33 secured to a sleeve 22 integral with the right-hand part 2 of a cylinder block 2, 3 to rotate the block which comprises a ring of cylinder spaces 7 housing pistons 15 associated with separate thrust rods 17 and engaged by inclined reaction members 48, 51 at opposite sides of the block 2, 3, the members being secured together by a cylinder 56 and mounted therewith in ball bearings 61 in an outer cylinder 67. This cylinder swivels about an axis perpendicular to the axis of the cylinder block 2, 3 under control of an arm 81 moved hydraulically to vary the inclination of the reaction members. A second set of cylinders 14, pistons 16 and thrust rods 19 facing the opposite way is arranged between the cylinders 7. Cylinder ports 90, 91 in the two sets respectively open into inlet grooves 103, 108, Fig. 4, or outlet grooves 93, 106 in a stationary pintle 21 coaxial with the cylinder block 2, 3. These grooves which extend over slightly less than half the circumference of the pintle, connect with longitudinal inlet and outlet, passages, such as 107, 95 respectively leading from an inlet I or to an outlet port 98 in an outlet O. To save space, operative flanges 49, 52 on the reaction members are directed inwardly into annular grooves 54, 55 in the cylinder block. The tendency of the liquid under pressure to increase the tilt of the reaction assembly is counteracted by introducing outlet pressure to grooves 110, 113 in the pintle and straddling the inlet and delivery grooves and inlet pressure to their opposite grooves 109, 114. The cylinder spaces may be duplicated, the thrust rods extending between the pistons which are engaged, by the reaction members directly. In a further construction, Fig. 15, the inlet and delivery grooves 161, 162 for the cylinders facing left are formed in a collar 157 shrunk on the pintle 152 and those for the other cylinders in a similar collar 158. Further collars 171, 172 on the pintle lie outside these collars and adjacent collars are separated by rings 190, 184 and 191 carried by the cylinder block. Adjacent side walls of the collars and rings are recessed and the recesses inter-communicate through passages such as 188 to supply the pressure opposing the tilting pressure.